Huge gas pressure drop between meter and boiler. Help!

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ScottishGasMan said:
System boiler, so unless its been fitted with vaillant controls which I imagine its not, then you need the higher flow temp for DHW production. Had it had vaillant controls then you could select independent flow temps for heating and then higher one for DHW (or even lower for DHW and weekly legionella cycle)

ABV not required by this boiler, so wont have any real effect on it.
Click to expand...

So no point in this boiler being condensing?

Is that not a gross install error and against best practice?

If not, is it not also "a good idea" to get proper controls so that it does condensing?
 
BlueLoo said:
So no point in this boiler being condensing?

Is that not a gross install error and against best practice?

If not, is it not also "a good idea" to get proper controls so that it does condensing?
Click to expand...

Of course it's far better to control any system pretty much with weather compensation and priority DHW, but that comes at a cost itself, its still not widely understood by many in the industry so not promoted by your average Joe.

In the UK the industry falls far behind some other countries in terms of quality of installs but also quality of customers, most folk will not part with a penny more than they can get away with when it comes to their heating but wi blow silly amounts on cars and kitchens. So even the guys who do spec higher quality installs face a never ending uphill battle of educating customers and justifying their higher costs
 
In a previous life as a warranty engineer I mainly visited new (<5 year old) systems, and can easily say 95% were left set at fixed 75⁰c CH flow.
 
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Harry Bloomfield said:
It says 'OR'. Suggesting 'Burner operating pressure' OR 'Burner input pressure'. Later item is indicated to be 20mbar for both HW and CH.
Click to expand...
Harry it does not say "burner input pressure" appliance inlet working pressure and burner pressures are completely different
 
ScottishGasMan said:
In a previous life as a warranty engineer I mainly visited new (<5 year old) systems, and can easily say 95% were left set at fixed 75⁰c CH flow.
Click to expand...

It's law in the UK to only sell condensing boilers no?
Must also be law that they are installed with appropriate controls to ensure they operate in condensing mode else what is the point? Lol.

Wait, they are more expensive and complex than non condensing so....

In my work, I'm forever telling younger engineer's that codes only do so much...
 
BlueLoo said:
It's law in the UK to only sell condensing boilers no?
Must also be law that they are installed with appropriate controls to ensure they operate in condensing mode else what is the point? Lol.
Click to expand...
  • Yes, only condensing boilers allowed to be sold
  • Boiler plus is the minimum standard along with boiler interlock - not sure if regulated that well, if at all
  • Best will in the world, could be setup correctly, customer not happy as rads don’t make them have red hands after touching, become google warriors, or ask on forums, like DIYnot.com how to increase their temperatures etc.
 
Condensing boilers are still more efficient than their Std eff counterparts, even when there not condensing. Enough that there was a notable drop in domestic gas use after the introduction of condensing only boilers. But that could be a further 5-10% had they legislated that they must be on lower temperature systems
 
CBW said:
  • Yes, only condensing boilers allowed to be sold
  • Boiler plus is the minimum standard along with boiler interlock - not sure if regulated that well, if at all
  • Best will in the world, could be setup correctly, customer not happy as rads don’t make them have red hands after touching, become google warriors, or ask on forums, like DIYnot.com how to increase their temperatures etc.
Click to expand...

Unfortunately boiler plus was hijacked by controls manufacturers and diluted down to be essentially meaningless
 
  • Thanks
Reactions: CBW
ScottishGasMan said:
Condensing boilers are still more efficient than their Std eff counterparts, even when there not condensing. Enough that there was a notable drop in domestic gas use after the introduction of condensing only boilers. But that could be a further 5-10% had they legislated that they must be on lower temperature systems
Click to expand...

With better controls.
 
ScottishGasMan said:
Condensing boilers are still more efficient than their Std eff counterparts, even when there not condensing. Enough that there was a notable drop in domestic gas use after the introduction of condensing only boilers. But that could be a further 5-10% had they legislated that they must be on lower temperature systems
Click to expand...

A 10% saving on current/future gas bills can be big money.
Perhaps something for the OP to add to the shopping list.

Thanks for the replies. Interesting stuff.
 
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